Tommy Deans, BEAR Scotland's South East Network Manager, said: "These drainage investigations will improve the performance of the existing pipework and will inform of any repairs required for the next phase of improvement works in the area.
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"We've scheduled the works at night to minimise disruption, however if you do need to use this route our advice is to plan ahead and allow a few extra minutes for your journey."
To allow works to be carried out safely, the slip road will be closed from 20:30 until 06:00 each night.
A clearly signed diversion route will be in place, directing traffic to continue westbound to turn at Junction 4A and return eastbound to exit at M8 Junction 4 eastbound off-slip. This diversion will add approximately six minutes and 4.6 miles to affected journeys.
Access for emergency vehicles will be maintained at all times.
